18213222 has 16 divisors (see below), whose sum is σ = 38569392. Its totient is φ = 5713920.

The previous prime is 18213211. The next prime is 18213233. The reversal of 18213222 is 22231281.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18213211) and next prime (18213233).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89179 + ... + 89382.

It is an arithmetic number, because the mean of its divisors is an integer number (2410587).

Almost surely, 2^18213222 is an apocalyptic number.

18213222 is an abundant number, since it is smaller than the sum of its proper divisors (20356170).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18213222 is a wasteful number, since it uses less digits than its factorization.

18213222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178583.

The product of its digits is 384, while the sum is 21.

The square root of 18213222 is about 4267.6951624970. The cubic root of 18213222 is about 263.1048943776.

The spelling of 18213222 in words is "eighteen million, two hundred thirteen thousand, two hundred twenty-two".